Hydrochloric Acid → (4S)-4-(2-chloroethyl)-1,3,2-dioxathiolane 2-oxide

To a solution of (2S)-butane-1,2,4-triol (10.0 g) and pyridine (15.2 mL) in acetonitrile (100 mL) was added thionyl chloride (34.4 mL) at 0° C., and the mixture was stirred at room temperature for 15 hr. Ethyl acetate (20 mL) and 0.1M hydrochloric acid (10 mL) were added to the reaction mixture, and the separated aqueous layer was extracted with ethyl acetate (10 mL×2). The combined organic layers were washed with brine (20 mL) and dried over anhydrous magnesium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane), and the object fraction was concentrated under reduced pressure to give (4S)-4-(2-chloroethyl)-1,3,2-dioxathiolane 2-oxide as a brown oil. A mixture of (4S)-4-(2-chloroethyl)-1,3,2-dioxathiolane 2-oxide produced above, sodium periodate (19.6 g), ruthenium chloride monohydrate (172 mg), acetonitrile (200 mL) and water (40 mL) was stirred at room temperature for 15 hr. Acetonitrile was evaporated under reduced pressure, and the aqueous layer was extracted with ethyl acetate (10 mL×2). The combined organic layers were washed with brine (20 mL) and dried over anhydrous magnesium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane), and the object fraction was concentrated under reduced pressure to give the title compound (14.2 g) as a colorless oil.

1. extractionthe separated aqueous layer was extracted with ethyl acetate (10 mL×2)
2. washThe combined organic layers were washed with brine (20 mL)
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationInsoluble material was filtered off
5. concentrationthe filtrate was concentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (ethyl acetate/hexane)
7. concentrationthe object fraction was concentrated under reduced pressure

ORDレコード

ord-620acb9ab8224324809b1023deb3ead3

出典データセット

uspto-grants-2014_05

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08722660B2